/* eslint-disable */
export function download(data, strFileName, strMimeType) {
  // eslint-disable-next-line one-var
  let self = window, // this script is only for browsers anyway...
    defaultMime = 'application/octet-stream', // this default mime also triggers iframe downloads
    mimeType = strMimeType || defaultMime,
    payload = data,
    url = !strFileName && !strMimeType && payload,
    anchor = document.createElement('a'),
    toString = function(a) {
      return String(a)
    },
    myBlob = (self.Blob || self.MozBlob || self.WebKitBlob || toString),
    fileName = strFileName || 'download',
    blob,
    reader
  myBlob = myBlob.call ? myBlob.bind(self) : Blob

  if (String(this) === 'true') { // reverse arguments, allowing download.bind(true, "text/xml", "export.xml") to act as a callback
    payload = [payload, mimeType]
    mimeType = payload[0]
    payload = payload[1]
  }
  // debugger
  if (url && url.length < 2048) { // if no filename and no mime, assume a url was passed as the only argument
    // 获得文件后缀
    // debugger
    // const urlFileName = url.split('/').pop().split('?')[0] // 文件名加后缀
    // const suffix = urlFileName.substring(url.lastIndexOf('.'))// 文件名加后缀
    //
    fileName = url.split('/').pop().split('?')[0]
    // fileName = strFileName + suffix// 文件名加后缀
    anchor.href = url // assign href prop to temp anchor
    if (anchor.href.indexOf(url) !== -1) { // if the browser determines that it's a potentially valid url path:
      let ajax = new XMLHttpRequest()
      ajax.open('GET', url, true)
      ajax.responseType = 'blob'
      ajax.onload = function(e) {
        download(e.target.response, fileName, defaultMime)
      }
      setTimeout(function() {
        ajax.send()
      }, 0) // allows setting custom ajax headers using the return:
      return ajax
    } // end if valid url?
  } // end if url?

  // go ahead and download dataURLs right away
  if (/^data:([\w+-]+\/[\w+.-]+)?[,;]/.test(payload)) {
    if (payload.length > (1024 * 1024 * 1.999) && myBlob !== toString) {
      payload = dataUrlToBlob(payload)
      mimeType = payload.type || defaultMime
    } else {
      return navigator.msSaveBlob // IE10 can't do a[download], only Blobs:
        ? navigator.msSaveBlob(dataUrlToBlob(payload), fileName)
        : saver(payload) // everyone else can save dataURLs un-processed
    }
  } else { // not data url, is it a string with special needs?
    if (/([\x80-\xff])/.test(payload)) {
      // eslint-disable-next-line one-var
      let i = 0,
        tempUiArr = new Uint8Array(payload.length),
        mx = tempUiArr.length
      for (i; i < mx; ++i) tempUiArr[i] = payload.charCodeAt(i)
      payload = new myBlob([tempUiArr], {
        type: mimeType
      })
    }
  }
  blob = payload instanceof myBlob
    ? payload
    : new myBlob([payload], {
      type: mimeType
    })

  function dataUrlToBlob(strUrl) {
    // eslint-disable-next-line one-var
    let parts = strUrl.split(/[:;,]/),
      type = parts[1],
      indexDecoder = strUrl.indexOf('charset') > 0 ? 3 : 2,
      decoder = parts[indexDecoder] == 'base64' ? atob : decodeURIComponent,
      binData = decoder(parts.pop()),
      mx = binData.length,
      i = 0,
      uiArr = new Uint8Array(mx)

    for (i; i < mx; ++i) uiArr[i] = binData.charCodeAt(i)

    return new myBlob([uiArr], {
      type: type
    })
  }
  function doSth(e) {
    e.stopPropagation()
    this.removeEventListener('click', doSth)
  }
  function saver(url, winMode) {
    if ('download' in anchor) { // html5 A[download]
      anchor.href = url
      anchor.setAttribute('download', fileName)
      anchor.className = 'download-js-link'
      anchor.innerHTML = 'downloading...'
      anchor.style.display = 'none'

      anchor.addEventListener('click', doSth)
      document.body.appendChild(anchor)
      setTimeout(function() {
        anchor.click()
        document.body.removeChild(anchor)
        if (winMode === true) {
          setTimeout(function() {
            self.URL.revokeObjectURL(anchor.href)
          }, 250)
        }
      }, 66)
      return true
    }

    // handle non-a[download] safari as best we can:
    if (/(Version)\/(\d+)\.(\d+)(?:\.(\d+))?.*Safari\//.test(navigator.userAgent)) {
      // eslint-disable-next-line no-useless-escape
      if (/^data:/.test(url)) url = 'data:' + url.replace(/^data:([\w\/\-\+]+)/, defaultMime)
      if (!window.open(url)) { // popup blocked, offer direct download:
        if (confirm('Displaying New Document\n\nUse Save As... to download, then click back to return to this page.')) {
          location.href = url
        }
      }
      return true
    }

    // do iframe dataURL download (old ch+FF):
    let f = document.createElement('iframe')
    document.body.appendChild(f)

    if (!winMode && /^data:/.test(url)) { // force a mime that will download:
      // eslint-disable-next-line no-useless-escape
      url = 'data:' + url.replace(/^data:([\w\/\-\+]+)/, defaultMime)
    }
    f.src = url
    setTimeout(function() {
      document.body.removeChild(f)
    }, 333)
  } // end saver

  if (navigator.msSaveBlob) { // IE10+ : (has Blob, but not a[download] or URL)
    return navigator.msSaveBlob(blob, fileName)
  }

  if (self.URL) { // simple fast and modern way using Blob and URL:
    saver(self.URL.createObjectURL(blob), true)
  } else {
    // handle non-Blob()+non-URL browsers:
    if (typeof blob === 'string' || blob.constructor === toString) {
      try {
        return saver('data:' + mimeType + ';base64,' + self.btoa(blob))
      } catch (y) {
        return saver('data:' + mimeType + ',' + encodeURIComponent(blob))
      }
    }

    // Blob but not URL support:
    reader = new FileReader()
    reader.onload = function() {
      saver(this.result)
    }
    reader.readAsDataURL(blob)
  }
  return true
} /* end download() */